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Showing results for tags 'food safe'.
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Hello! Is it possible to high fire a glaze on the interior of a cup and around its lip, and to then pit fire? I'm trying to find a way to make pit-fired cups food/water-safe! I'm assuming that this process wouldn't affect the high-fire glaze, but perhaps the outside (unglazed) body would no longer be able to take in the marvelous colors produced in a pit fire? I'm new to this process, but will be doing a ton of experimenting over the coming months with local blue clay that I've begun harvesting. Thanks for any insights!
Because of the nature of sourdough, I want to be sure the clear, cone 6 glaze that I am using is safe. Following is the recipe --- Spodumene 35% SGP-1 (ball clay) - 12% Whiting - 17% Flint - 19% Ferro Frit 3134 - 17% Bentonite - 6% I hope someone can give me some insight on the safety of this glaze and a suggestion if you do not think it is safe. Thank you for your help.
Hi everyone, I have been trying to get a definitive answer to whether or not my low fire shino is truly food safe. Here is the recipe: Lithium carb 26 Neph sy 64 EPK 10 I know that the powdered form of lithium carbonate is considered toxic and precautions should be used in glaze preparation. However once it it fired to maturity (cone 04 for this glaze) it is converted to lithium oxide. I could me misunderstanding, but I have read that in the oxide form, it is safe. Can anyone shed any light on this for me? I love this glaze for its semi-matte texture, beautiful color development, and interesting reactions with other glazes. If it isn't food safe, I would love to know how I could alter it so that it is. Thank you in advance for your help! Sloane
Joseph F posted a topic in Clay and Glaze ChemistryHello! New potter here and I am trying to always start in the right direction and make sure everything I make is responsible and safe for anyone who I give or hopefully sell my pottery too one day. I have ordered a few of the pint sized potter's choice glazes for layering a few cups and bowls I was going to make for my own personal use. However I have been studying up on these forums and reading through all of the FAQ and I realized that just because they are AP safety rating and dinnerware safe doesn't mean once I layer them they still will be. In fact AMACO even states: At the time when I ordered these glazes I missed that message nicely placed at the bottom of their website under all the benefits of their safe glazes. However I did make sure I bought all AP safety rating glazes as I have a 3.5 year old around and even though hes a smart guy, you never know what kids are going to do, much less his friends. My question is, has anyone used some combination of the potter's choice glazes that are listed here: http://www.amaco.com/amaco-glazes-information/layering-potters-choice-glazes/ and have had them sent off for testing? Is it even possible for us to list what we have done here and be confident that we are producing safe pots for our own personal use? And if so would we be able to use for this thread is to list glaze combinations that we have sent off for testing before we make some plates/cups/bowls for our personal household use. I was hoping that I could list the bisque firing, clay type, glazes used, # of layers, layering order, and glaze firing schedule for future people who use the same glaze choices as I have decided too. I am almost regretting my decision to buy potters choice glazes now, because I don't feel like I can safely use them without sending each combination I have made off for testing. I don't particularly care for some the base colors of the glaze as much as I do the combination effects. For now I am thinking I might just end up using the celebration glazes in single layers while I have some sample cups sent off for safety testing. I know a lot of people make their own glazes and know that their combinations after making them have been safety approved. As a new potter I haven't moved on to creating my own glazes yet. Although now it seems like I need to invest in purchasing "Mastering Cone 6 Glazes", and start creating my own as soon as possible. Hope this all makes sense, and I hope that others have had some experience with this to give me some insights into what I might be up against? Thanks Joe